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Apache jSieve is a server side mail filtering system implementing RFC3028. Apache jSieve is developed by the JAMES project.

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package org.apache.jsieve;

import org.apache.jsieve.comparators.Comparator;
import org.apache.jsieve.exception.LookupException;

/**
 * Maps Comparator names to configured Comparator implementation classes.
 */
public interface ComparatorManager {

    /**
     * 
     * Method newInstance answers an instance of the class to which a Comparator
     * name is mapped.
     * 
     * 
     * @param name -
     *            The name of the Comparator
     * @return Class - The class of the Comparator
     * @throws LookupException
     */
    public Comparator getComparator(String name) throws LookupException;
}